Can I delete cache and media cache of any program at Roaming Folder C:\\Users\\user_name\\AppData\\Roaming\\ , is there easy program to delete cache?

You can try to use CCleaner to clean your system cache file. It’s easy and secure. Manually deleting cache or fixup registry might be dysfunction your system smooth working. CCleaner is an easy and free application, it can help you to run your system to removing temporary file, cache file and registry bugs accurately in a click.

you can use Disk Cleanup

you can delete that file direct or you can use CCleaner for example very good tools and free

use disk clean up dont delete directory because most of programs needs files stored at same location.